D'Addario Mandolin Phosphor Bronze Bluegrass, .011 - .040, EJ745Bo CarnealJuly 14, 2011I have a Gibson F-5G and these strings are the standard for me. Excellent playability and tone for any genre you wish to play. I play every day and these strings hold their own for one week, you can get an extra 1-2 days out of them by performing a string cleaning. I perform on occasion and would not choose any other string.